Improvement in construction of hot-water boilers



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Letters Patent No.l 93,139, dated J'fuly 27, 1869.

IMPROVEMENT IN CONSTRUCTION OIE' HOT-,WTER BOILERS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concernv Be it known that I, J or'IN TRAGESER, of the city and State of New York, have invented and made a new and useful Improvement in Hot-Water. Boilers; and I do hereby declare the following to be a full, clear, and exact description ofthe said invention, referencel being had to the annexed drawing, making part of' this specification, wherein- Figure l is a partial vertical section of a boiler as fitted with my improvement.

lhe other iigures are separately referred to, and the corresponding parts similarly lettered.

This invention relates to the uniting of the convex head et to the cylindrical shell b, iu -a boiler made of sheet-copper or other metal, and adapted to standing near a stove or range, so that the water therein'will be heated by circulation from a water-back near the tire.

The sheet-metal of the head has been united with that of the cylinder', by slipping one into the other and forming ribs and grooves in the sheet-metal where the two thicknesses come together. This, however, does not give a good opportunity for soldering the joint, and there is not always certainty that the thin sheet-metal of the joint will not give way under the pressure upon the head.

'lhe nature ofhny said invention consists in a boiler with a double-iblded seam at the union of the head' and cylinder, combined wit-l1 ribs or grooves forming a space into which the solder is introduced, to strengthen ahdstiii'en 'the joint, and atthe4 same time render the part-s perfectly tight.

In Figures', 3, 4, and 5, the successive stages in the formation of the joint are represented.

I form, on the cylinder l), a ange 1,.(see tig. 2,) and 'upon the head a, the flange 2, and set the one within the other. rIhe edge of the flange 1 is then turned over the flange 2, as'at 3,'tlg. 3; then the parts 1, 2, and 3, are dressed or pressed up against the side of the lower or cylindrical portion of the head a, as seen at fig. 4, so as to form a double-folded joint or seam.

The parts are then pressed together, and grooves 4, formed as seen in iig. 5; vat the saine time the folded seam is made 'concave upon thev inner surface, and a solder-space is left between the grooves 4, which project inwardly as ribs, and into this space the solder is introduced, and melted so as' torun into the folded seani around between the head and cylinder, and ill or nearly till the solder-space, as seen in iig. 5, and

thereby strengthen the boiler, and make the joint,

perfectly tight.

What I claim, and desire to secure by Letters Pat ent, is-

The double-folded seam, uniting the head. and cylinder-of the boiler, combined with the grooves and solder, employed in the manner and for the purposes set forth. v

In witness whereof, I have hereunto set iny sig-nature, this 8th day of June, A. D. 1869.

JOHN TRAGESER.

Witnesses Gno. T. PINCKNEY, CEAS. H. SMITH. 

